Thread-lock for sewing-machines.



W.- R. BLAIR.

THREAD LOCK FOB. SEWING HAC Patented Jan. 24,'191.

I Y LYLIULTIDB FILED JUNE 24, lfl. 989,234.

' consists in the construction, arrangement after-"pointed out in theclaims.

Bisslidahly mounted' a member 4 having a PANY, OF ST. LOUIS, MISSOURI,

' THREAD-LOCK FOR SEWIIQ'G-LIACHINBS.

ing is a full, clear, and exact description,

l' f such as will enable others sla'iled in the art `to which itappertains to make and use the 10- same, reference being had to theaccompany- -ving drawines, forming part ofthis specifi cation, in wlich-'1 f thread locking or tension device in position t i- '1-5 torelease the thread. F 1g. 2 is a sectional Yelevation ofthe threadtension shown 1n F ig. l, looking inthe direction of the arrow.

- Fig. 8 is a Vfrapnnentary View of the-tension i device in position tolock the thread. Fig.

i 2O #-1 is a View in elevation of the tension device -with operatingmeans. Fig. 5 is a detail view showing the thread locking jaws. v

This invention relates to. a new and iml proved thread Vlocking ortension device,

425-which may be applied to any type of mai i chine and it is especiallyadapted for use in connection with. wax thread sewing niachines ofthewell known type. Y i

The object of my present invention is to i 30 improve the old type oftension devices by i constructing the jaws 'with op osing curvedsurfaces so as to form a lcink 1n the thread,

and thereby produce-a more positive lock.

vIt is. a further object of my inventionto 'g 35 operate the clampingjaws from a cam conf nected to the take-up device.

With these objects in View my invention.

and combination of the Various parts of rny 1Q device, nsare hereindescribed f- In the drawings, 1 indicates arecessed A Aboss' on theframeof the machine, a portion jof the interior of which is threaded as in`45 dicated bynumeral. -I'Yithin'the opening `s pindle 5 attachedthereto. V'Screwed within the boss 1 is an adjustable nut 6 with nurl'headLthisnut being hollow to allow the pas- ""'5 0 sage'of the spindle5.' Y Lying between the end ofthe nut G and theshoulder 8 formed betweenthe union of the part,- 4 with the spindle-5 isfahelical springt)surrounding f the spindle. At the lower Vend of the mem- "j i55 ber f1 ac am portionf1'. -..Afoove this cnm i unrrnn sfrafrns earner Sermon; i

WILLIAM R. BLAIR, OF ST. LOUIS, MISSOURI, ASSIGNOR TO LANDES MACHINECOM- Specification of Letters Patent.

Application led Inne 24, 1910. Serial No. 588,731.

Vthe clamping surface for a -thread when vLito correspond withthecuri'ature'of the Y 'Figure l is a side sectional viewof the and throughthe member-20 over guide roll l As the lever 19 is moved into aposition,

i of the arms 20 and''l, and simultaneously 5 and there? i 12 of thethread tension device-4 so thatthe AVspring 9 acts to push the'jawsurface 13.

11. B 4forming the surfaces 13 and- 15- asf reverseylcurvedvthethreadclarnpedthere tension is more positive. V:By the adjust` ment ofthe-screwby the nurl head 'fthe f 'can be made and subStitutedorthoselieref il l A CORPORATION 0F MISSOURI.

Patented Jan. 2, 1911.

formed surface 12 the member is made to torm two surfaces 13 and 14, thesurface 13' 1 heilig reversely curved and serving to form locked.Mounted in the frame 1 is a pin member 10,v having ancnlarged head oranvil 11, extending between the. surfaces. 13 and l of the member 4, andcurved on .its 'top surface 65 Q surface 13 on the member al. The lowersur- Y l face ofthe head 1l is spaced sui'iiciently ronr the surface 11of 'the member' to alow.. this member'to be mov-eilte sepan-ite thesurfaces '13 and 15 without engaging the'm surface 14. The pin member 10between ,the part extending into the frame 1 and the head 11isshouldered as at 1'( 'to itthe corre-. spending groove 16 in thcmember 4.' Pivoted on the stud 18 in the frame'of-the 75 machine below"the .tension device is. the ordinary' take-up lever 19 having the threadengaging ends 20 and Q1. Blounted on a stud 2l is a camv 25 which isconnected through a link 23 with a stud 22 on the so lever 19. Thethread extends from an eyelet :26 on the frame l through the tensionlock 2T, and through the arm' 21 to the wax pot of the machine. Theeyelet 26, tension lock, arms 20 and 21 and the guide roll 27 are soarranged that the thread passes in a sub stantially straight linethroughv these elements. The operation of the device is as follows;

shownin dotted lines in Fig. 4the thread'issV pulled through the wax potby the action i the cam 25 is moved away from the surface 951-. 'i'

downward to clamp the threadbetwecn this surface and the jaw snrfacel ofthe anvil between is deflected, or kinked, so. that the i! pressure'exerted by the spring 9 may be 105 am aware thatrninor changes inthecoiif struction and arrangement and' combination of the various partsofmy improved -devlce Qns.

uio.

-rnise said yoke-shaped member.

. A tension device, comprising a pin in slmwnnntl described, Withoutdeparting from the nature :1nd splrxt of my invention.

This tension device muy also he used in other connections und onmachines other than sewing machines.

I clnini:

l. )t tension device, comprising a pin member 'mounted in the frame ofthe 1nnchine and formed at one end with a head d1' anvil having a threadengaging surface, a yoke-shaped nieniber surrounding the anvil andhaving a thread engaging surface op posed to that'. on the anvil, andmeans to member mounted in the frame ofthe mibV chine and formed at oneend with a head or A. :uml*having a thi-eno engaging surface,

and a spring actuated yoke-shuped member snrwnnding the 'anvil-andhaving :t thread engaging surface oppose@` to that. on the 3. Injcombination, atake-up lever, an irlclependently mounted cam, a. linkconnecting said lever and cam, n tension' clamp lia-fing emperntivejthread engaging curved surfaces, and arranged to be released by the el.In u machine, a frame work, pin fixed thereto and projecting laterallytherefrom having :in enlarged head or anvil, :i memher slidably mountedin an opening in the Vtrarne work aboe the pin, and adapted `tocoi'xpclntc with the anvil lo form :1 clump, und n .spring acting uponSaid slidably mounted member.

5. lu :i machine, n frame woz-lc. n pin projecting laterally therefromhaving nn enlarged bend or anvil, n sliflably mounted.

oke-sln11 ied member, said yoke portion einiucing t ie head or anvil ofthe pin.

6. In a Lachine, a frame work, a. pin prof jeeting laterally therefromhaving :in en 4o Y l largecl head or anvil, a slidably mountedyoke-shaped member, said yolzepoi'tion einbracing the head or nnil ofthe pin, un oscillatory cani adapted to engage the lower.

end ofthe slidably mounted member, and means to actuate said earn.

'l'. In n machine, n frame Work, a pin pro-* jecting laterally therefromhaving an enlarged head or anvil', aslidnbly mounted"vyoke-shapedniernber said yoke'portion'em-- bracing theliead or anvil ofthe pin, an

'oscillatory cam adapted toengage the lower end ofv the, slidablymounted member, .a tulle. up lever, ond-means connecting said cam andtake-up lever to actunte said com;

In testimony whereof I hereunto aix myf' signature 1n the presence ottwo witnesses,

this 21st clay of June, 1910.

i WILLIAM n. Bnltmlf Vitnessesf n l M. P.- SMITH, v

J. W. Curr.

.l l l l l

